So I want to tap into the positive side of my dome light circuit to power my new floor lights.

I located the positive wire on my truck that i need to tap into at the dome light on the roof. It is a solid black wire which corresponds to the Haynes schematic for that circuit

This specific wire runs to the Integration Relay located somewhere in the truck. I figure that it is under the dash somewhere. That would be perfect because my new lights will be placed under the dash.

Yay problem solved, I know what it looks like, now I can splice into that black wire attached to the integration relay. Nope. the actual thing looks very different from the picture

It doesn't look exactly like the diagram, but it is similar in the fact that it has some wires attached below some fuses. Other than that, it is totally different. There is 1 black wire (what i'm looking for) but I'm not sure if that is actually the wire I need since I don't know if this is the integration relay.

I looked behind that fuse box and saw a big mess. Lots of wires, at least 4 of them were black, all plugged into different things.

This is on the backside of the object in the first picture. Only about a third of the wires are showing. the rest are hiding in the shadows.

I know exactly what connector on your integration module controls the dome lights. It's a small two wire connector at the top left of the assembly, you can confirm by plugging and unplugging it with the dome lights on.